4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * Common Internet FileSystem (CIFS) client
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 /* Note that BB means BUGBUG (ie something to fix eventually) */
26 #include <linux/module.h>
28 #include <linux/mount.h>
29 #include <linux/slab.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/seq_file.h>
33 #include <linux/vfs.h>
34 #include <linux/mempool.h>
35 #include <linux/delay.h>
36 #include <linux/kthread.h>
37 #include <linux/freezer.h>
38 #include <linux/smp_lock.h>
41 #define DECLARE_GLOBALS_HERE
43 #include "cifsproto.h"
44 #include "cifs_debug.h"
45 #include "cifs_fs_sb.h"
47 #include <linux/key-type.h>
48 #include "dns_resolve.h"
49 #include "cifs_spnego.h"
50 #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
52 #ifdef CONFIG_CIFS_QUOTA
53 static struct quotactl_ops cifs_quotactl_ops;
59 unsigned int oplockEnabled = 1;
60 unsigned int experimEnabled = 0;
61 unsigned int linuxExtEnabled = 1;
62 unsigned int lookupCacheEnabled = 1;
63 unsigned int multiuser_mount = 0;
64 unsigned int extended_security = CIFSSEC_DEF;
65 /* unsigned int ntlmv2_support = 0; */
66 unsigned int sign_CIFS_PDUs = 1;
67 extern struct task_struct *oplockThread; /* remove sparse warning */
68 struct task_struct *oplockThread = NULL;
69 /* extern struct task_struct * dnotifyThread; remove sparse warning */
70 static const struct super_operations cifs_super_ops;
71 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
72 module_param(CIFSMaxBufSize, int, 0);
73 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
74 "Default: 16384 Range: 8192 to 130048");
75 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
76 module_param(cifs_min_rcv, int, 0);
77 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
79 unsigned int cifs_min_small = 30;
80 module_param(cifs_min_small, int, 0);
81 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
83 unsigned int cifs_max_pending = CIFS_MAX_REQ;
84 module_param(cifs_max_pending, int, 0);
85 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
86 "Default: 50 Range: 2 to 256");
88 extern mempool_t *cifs_sm_req_poolp;
89 extern mempool_t *cifs_req_poolp;
90 extern mempool_t *cifs_mid_poolp;
92 extern struct kmem_cache *cifs_oplock_cachep;
95 cifs_read_super(struct super_block *sb, void *data,
96 const char *devname, int silent)
99 struct cifs_sb_info *cifs_sb;
102 /* BB should we make this contingent on mount parm? */
103 sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
104 sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
105 cifs_sb = CIFS_SB(sb);
109 #ifdef CONFIG_CIFS_DFS_UPCALL
110 /* copy mount params to sb for use in submounts */
111 /* BB: should we move this after the mount so we
112 * do not have to do the copy on failed mounts?
113 * BB: May be it is better to do simple copy before
114 * complex operation (mount), and in case of fail
115 * just exit instead of doing mount and attempting
116 * undo it if this copy fails?*/
118 int len = strlen(data);
119 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
120 if (cifs_sb->mountdata == NULL) {
121 kfree(sb->s_fs_info);
122 sb->s_fs_info = NULL;
125 strncpy(cifs_sb->mountdata, data, len + 1);
126 cifs_sb->mountdata[len] = '\0';
130 rc = cifs_mount(sb, cifs_sb, data, devname);
135 ("cifs_mount failed w/return code = %d", rc));
136 goto out_mount_failed;
139 sb->s_magic = CIFS_MAGIC_NUMBER;
140 sb->s_op = &cifs_super_ops;
141 /* if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
143 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
144 #ifdef CONFIG_CIFS_QUOTA
145 sb->s_qcop = &cifs_quotactl_ops;
147 sb->s_blocksize = CIFS_MAX_MSGSIZE;
148 sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
149 inode = cifs_iget(sb, ROOT_I);
157 sb->s_root = d_alloc_root(inode);
164 #ifdef CONFIG_CIFS_EXPERIMENTAL
165 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
166 cFYI(1, ("export ops supported"));
167 sb->s_export_op = &cifs_export_ops;
169 #endif /* EXPERIMENTAL */
174 cERROR(1, ("cifs_read_super: get root inode failed"));
178 cifs_umount(sb, cifs_sb);
182 #ifdef CONFIG_CIFS_DFS_UPCALL
183 if (cifs_sb->mountdata) {
184 kfree(cifs_sb->mountdata);
185 cifs_sb->mountdata = NULL;
188 if (cifs_sb->local_nls)
189 unload_nls(cifs_sb->local_nls);
196 cifs_put_super(struct super_block *sb)
199 struct cifs_sb_info *cifs_sb;
201 cFYI(1, ("In cifs_put_super"));
202 cifs_sb = CIFS_SB(sb);
203 if (cifs_sb == NULL) {
204 cFYI(1, ("Empty cifs superblock info passed to unmount"));
207 rc = cifs_umount(sb, cifs_sb);
209 cERROR(1, ("cifs_umount failed with return code %d", rc));
210 #ifdef CONFIG_CIFS_DFS_UPCALL
211 if (cifs_sb->mountdata) {
212 kfree(cifs_sb->mountdata);
213 cifs_sb->mountdata = NULL;
217 unload_nls(cifs_sb->local_nls);
223 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
225 struct super_block *sb = dentry->d_sb;
226 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
227 struct cifsTconInfo *tcon = cifs_sb->tcon;
228 int rc = -EOPNOTSUPP;
233 buf->f_type = CIFS_MAGIC_NUMBER;
236 * PATH_MAX may be too long - it would presumably be total path,
237 * but note that some servers (includinng Samba 3) have a shorter
240 * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
242 buf->f_namelen = PATH_MAX;
243 buf->f_files = 0; /* undefined */
244 buf->f_ffree = 0; /* unlimited */
247 * We could add a second check for a QFS Unix capability bit
249 if ((tcon->ses->capabilities & CAP_UNIX) &&
250 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
251 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
254 * Only need to call the old QFSInfo if failed on newer one,
257 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
258 rc = CIFSSMBQFSInfo(xid, tcon, buf);
261 * Some old Windows servers also do not support level 103, retry with
262 * older level one if old server failed the previous call or we
263 * bypassed it because we detected that this was an older LANMAN sess
266 rc = SMBOldQFSInfo(xid, tcon, buf);
272 static int cifs_permission(struct inode *inode, int mask)
274 struct cifs_sb_info *cifs_sb;
276 cifs_sb = CIFS_SB(inode->i_sb);
278 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
279 if ((mask & MAY_EXEC) && !execute_ok(inode))
283 } else /* file mode might have been restricted at mount time
284 on the client (above and beyond ACL on servers) for
285 servers which do not support setting and viewing mode bits,
286 so allowing client to check permissions is useful */
287 return generic_permission(inode, mask, NULL);
290 static struct kmem_cache *cifs_inode_cachep;
291 static struct kmem_cache *cifs_req_cachep;
292 static struct kmem_cache *cifs_mid_cachep;
293 struct kmem_cache *cifs_oplock_cachep;
294 static struct kmem_cache *cifs_sm_req_cachep;
295 mempool_t *cifs_sm_req_poolp;
296 mempool_t *cifs_req_poolp;
297 mempool_t *cifs_mid_poolp;
299 static struct inode *
300 cifs_alloc_inode(struct super_block *sb)
302 struct cifsInodeInfo *cifs_inode;
303 cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
306 cifs_inode->cifsAttrs = 0x20; /* default */
307 atomic_set(&cifs_inode->inUse, 0);
308 cifs_inode->time = 0;
309 cifs_inode->write_behind_rc = 0;
310 /* Until the file is open and we have gotten oplock
311 info back from the server, can not assume caching of
312 file data or metadata */
313 cifs_inode->clientCanCacheRead = false;
314 cifs_inode->clientCanCacheAll = false;
315 cifs_inode->delete_pending = false;
316 cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
317 cifs_inode->server_eof = 0;
319 /* Can not set i_flags here - they get immediately overwritten
320 to zero by the VFS */
321 /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
322 INIT_LIST_HEAD(&cifs_inode->openFileList);
323 return &cifs_inode->vfs_inode;
327 cifs_destroy_inode(struct inode *inode)
329 kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
333 * cifs_show_options() is for displaying mount options in /proc/mounts.
334 * Not all settable options are displayed but most of the important
338 cifs_show_options(struct seq_file *s, struct vfsmount *m)
340 struct cifs_sb_info *cifs_sb;
341 struct cifsTconInfo *tcon;
342 struct TCP_Server_Info *server;
344 cifs_sb = CIFS_SB(m->mnt_sb);
347 tcon = cifs_sb->tcon;
349 seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
351 if (tcon->ses->userName)
352 seq_printf(s, ",username=%s",
353 tcon->ses->userName);
354 if (tcon->ses->domainName)
355 seq_printf(s, ",domain=%s",
356 tcon->ses->domainName);
357 server = tcon->ses->server;
359 seq_printf(s, ",addr=");
360 switch (server->addr.sockAddr6.
363 seq_printf(s, "%pI6",
364 &server->addr.sockAddr6.sin6_addr);
367 seq_printf(s, "%pI4",
368 &server->addr.sockAddr.sin_addr.s_addr);
373 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
375 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
376 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
378 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
379 if (!tcon->unix_ext) {
380 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
381 cifs_sb->mnt_file_mode,
382 cifs_sb->mnt_dir_mode);
385 seq_printf(s, ",seal");
387 seq_printf(s, ",nocase");
389 seq_printf(s, ",hard");
391 if (cifs_sb->prepath)
392 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
393 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
394 seq_printf(s, ",posixpaths");
395 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
396 seq_printf(s, ",setuids");
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
398 seq_printf(s, ",serverino");
399 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
400 seq_printf(s, ",directio");
401 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
402 seq_printf(s, ",nouser_xattr");
403 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
404 seq_printf(s, ",mapchars");
405 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
406 seq_printf(s, ",sfu");
407 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
408 seq_printf(s, ",nobrl");
409 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
410 seq_printf(s, ",cifsacl");
411 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
412 seq_printf(s, ",dynperm");
413 if (m->mnt_sb->s_flags & MS_POSIXACL)
414 seq_printf(s, ",acl");
416 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
417 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
422 #ifdef CONFIG_CIFS_QUOTA
423 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
424 struct fs_disk_quota *pdquota)
428 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
429 struct cifsTconInfo *pTcon;
432 pTcon = cifs_sb->tcon;
439 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
447 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
448 struct fs_disk_quota *pdquota)
452 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
453 struct cifsTconInfo *pTcon;
456 pTcon = cifs_sb->tcon;
462 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
470 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
474 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
475 struct cifsTconInfo *pTcon;
478 pTcon = cifs_sb->tcon;
484 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
492 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
496 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
497 struct cifsTconInfo *pTcon;
500 pTcon = cifs_sb->tcon;
506 cFYI(1, ("pqstats %p", qstats));
514 static struct quotactl_ops cifs_quotactl_ops = {
515 .set_xquota = cifs_xquota_set,
516 .get_xquota = cifs_xquota_get,
517 .set_xstate = cifs_xstate_set,
518 .get_xstate = cifs_xstate_get,
522 static void cifs_umount_begin(struct super_block *sb)
524 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
525 struct cifsTconInfo *tcon;
530 tcon = cifs_sb->tcon;
535 read_lock(&cifs_tcp_ses_lock);
536 if (tcon->tc_count == 1)
537 tcon->tidStatus = CifsExiting;
538 read_unlock(&cifs_tcp_ses_lock);
540 /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
541 /* cancel_notify_requests(tcon); */
542 if (tcon->ses && tcon->ses->server) {
543 cFYI(1, ("wake up tasks now - umount begin not complete"));
544 wake_up_all(&tcon->ses->server->request_q);
545 wake_up_all(&tcon->ses->server->response_q);
546 msleep(1); /* yield */
547 /* we have to kick the requests once more */
548 wake_up_all(&tcon->ses->server->response_q);
551 /* BB FIXME - finish add checks for tidStatus BB */
557 #ifdef CONFIG_CIFS_STATS2
558 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
565 static int cifs_remount(struct super_block *sb, int *flags, char *data)
567 *flags |= MS_NODIRATIME;
571 static const struct super_operations cifs_super_ops = {
572 .put_super = cifs_put_super,
573 .statfs = cifs_statfs,
574 .alloc_inode = cifs_alloc_inode,
575 .destroy_inode = cifs_destroy_inode,
576 /* .drop_inode = generic_delete_inode,
577 .delete_inode = cifs_delete_inode, */ /* Do not need above two
578 functions unless later we add lazy close of inodes or unless the
579 kernel forgets to call us with the same number of releases (closes)
581 .show_options = cifs_show_options,
582 .umount_begin = cifs_umount_begin,
583 .remount_fs = cifs_remount,
584 #ifdef CONFIG_CIFS_STATS2
585 .show_stats = cifs_show_stats,
590 cifs_get_sb(struct file_system_type *fs_type,
591 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
594 struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
596 cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
603 rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
605 up_write(&sb->s_umount);
606 deactivate_super(sb);
609 sb->s_flags |= MS_ACTIVE;
610 simple_set_mnt(mnt, sb);
614 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
615 unsigned long nr_segs, loff_t pos)
617 struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
620 written = generic_file_aio_write(iocb, iov, nr_segs, pos);
621 if (!CIFS_I(inode)->clientCanCacheAll)
622 filemap_fdatawrite(inode->i_mapping);
626 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
628 /* origin == SEEK_END => we must revalidate the cached file length */
629 if (origin == SEEK_END) {
632 /* some applications poll for the file length in this strange
633 way so we must seek to end on non-oplocked files by
634 setting the revalidate time to zero */
635 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
637 retval = cifs_revalidate(file->f_path.dentry);
639 return (loff_t)retval;
641 return generic_file_llseek_unlocked(file, offset, origin);
644 #ifdef CONFIG_CIFS_EXPERIMENTAL
645 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
647 /* note that this is called by vfs setlease with the BKL held
648 although I doubt that BKL is needed here in cifs */
649 struct inode *inode = file->f_path.dentry->d_inode;
651 if (!(S_ISREG(inode->i_mode)))
654 /* check if file is oplocked */
655 if (((arg == F_RDLCK) &&
656 (CIFS_I(inode)->clientCanCacheRead)) ||
658 (CIFS_I(inode)->clientCanCacheAll)))
659 return generic_setlease(file, arg, lease);
660 else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
661 !CIFS_I(inode)->clientCanCacheRead)
662 /* If the server claims to support oplock on this
663 file, then we still need to check oplock even
664 if the local_lease mount option is set, but there
665 are servers which do not support oplock for which
666 this mount option may be useful if the user
667 knows that the file won't be changed on the server
669 return generic_setlease(file, arg, lease);
675 struct file_system_type cifs_fs_type = {
676 .owner = THIS_MODULE,
678 .get_sb = cifs_get_sb,
679 .kill_sb = kill_anon_super,
682 const struct inode_operations cifs_dir_inode_ops = {
683 .create = cifs_create,
684 .lookup = cifs_lookup,
685 .getattr = cifs_getattr,
686 .unlink = cifs_unlink,
687 .link = cifs_hardlink,
690 .rename = cifs_rename,
691 .permission = cifs_permission,
692 /* revalidate:cifs_revalidate, */
693 .setattr = cifs_setattr,
694 .symlink = cifs_symlink,
696 #ifdef CONFIG_CIFS_XATTR
697 .setxattr = cifs_setxattr,
698 .getxattr = cifs_getxattr,
699 .listxattr = cifs_listxattr,
700 .removexattr = cifs_removexattr,
704 const struct inode_operations cifs_file_inode_ops = {
705 /* revalidate:cifs_revalidate, */
706 .setattr = cifs_setattr,
707 .getattr = cifs_getattr, /* do we need this anymore? */
708 .rename = cifs_rename,
709 .permission = cifs_permission,
710 #ifdef CONFIG_CIFS_XATTR
711 .setxattr = cifs_setxattr,
712 .getxattr = cifs_getxattr,
713 .listxattr = cifs_listxattr,
714 .removexattr = cifs_removexattr,
718 const struct inode_operations cifs_symlink_inode_ops = {
719 .readlink = generic_readlink,
720 .follow_link = cifs_follow_link,
721 .put_link = cifs_put_link,
722 .permission = cifs_permission,
723 /* BB add the following two eventually */
724 /* revalidate: cifs_revalidate,
725 setattr: cifs_notify_change, *//* BB do we need notify change */
726 #ifdef CONFIG_CIFS_XATTR
727 .setxattr = cifs_setxattr,
728 .getxattr = cifs_getxattr,
729 .listxattr = cifs_listxattr,
730 .removexattr = cifs_removexattr,
734 const struct file_operations cifs_file_ops = {
735 .read = do_sync_read,
736 .write = do_sync_write,
737 .aio_read = generic_file_aio_read,
738 .aio_write = cifs_file_aio_write,
740 .release = cifs_close,
744 .mmap = cifs_file_mmap,
745 .splice_read = generic_file_splice_read,
746 .llseek = cifs_llseek,
747 #ifdef CONFIG_CIFS_POSIX
748 .unlocked_ioctl = cifs_ioctl,
749 #endif /* CONFIG_CIFS_POSIX */
751 #ifdef CONFIG_CIFS_EXPERIMENTAL
752 .setlease = cifs_setlease,
753 #endif /* CONFIG_CIFS_EXPERIMENTAL */
756 const struct file_operations cifs_file_direct_ops = {
757 /* no mmap, no aio, no readv -
758 BB reevaluate whether they can be done with directio, no cache */
759 .read = cifs_user_read,
760 .write = cifs_user_write,
762 .release = cifs_close,
766 .splice_read = generic_file_splice_read,
767 #ifdef CONFIG_CIFS_POSIX
768 .unlocked_ioctl = cifs_ioctl,
769 #endif /* CONFIG_CIFS_POSIX */
770 .llseek = cifs_llseek,
771 #ifdef CONFIG_CIFS_EXPERIMENTAL
772 .setlease = cifs_setlease,
773 #endif /* CONFIG_CIFS_EXPERIMENTAL */
775 const struct file_operations cifs_file_nobrl_ops = {
776 .read = do_sync_read,
777 .write = do_sync_write,
778 .aio_read = generic_file_aio_read,
779 .aio_write = cifs_file_aio_write,
781 .release = cifs_close,
784 .mmap = cifs_file_mmap,
785 .splice_read = generic_file_splice_read,
786 .llseek = cifs_llseek,
787 #ifdef CONFIG_CIFS_POSIX
788 .unlocked_ioctl = cifs_ioctl,
789 #endif /* CONFIG_CIFS_POSIX */
791 #ifdef CONFIG_CIFS_EXPERIMENTAL
792 .setlease = cifs_setlease,
793 #endif /* CONFIG_CIFS_EXPERIMENTAL */
796 const struct file_operations cifs_file_direct_nobrl_ops = {
797 /* no mmap, no aio, no readv -
798 BB reevaluate whether they can be done with directio, no cache */
799 .read = cifs_user_read,
800 .write = cifs_user_write,
802 .release = cifs_close,
805 .splice_read = generic_file_splice_read,
806 #ifdef CONFIG_CIFS_POSIX
807 .unlocked_ioctl = cifs_ioctl,
808 #endif /* CONFIG_CIFS_POSIX */
809 .llseek = cifs_llseek,
810 #ifdef CONFIG_CIFS_EXPERIMENTAL
811 .setlease = cifs_setlease,
812 #endif /* CONFIG_CIFS_EXPERIMENTAL */
815 const struct file_operations cifs_dir_ops = {
816 .readdir = cifs_readdir,
817 .release = cifs_closedir,
818 .read = generic_read_dir,
819 .unlocked_ioctl = cifs_ioctl,
820 .llseek = generic_file_llseek,
824 cifs_init_once(void *inode)
826 struct cifsInodeInfo *cifsi = inode;
828 inode_init_once(&cifsi->vfs_inode);
829 INIT_LIST_HEAD(&cifsi->lockList);
833 cifs_init_inodecache(void)
835 cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
836 sizeof(struct cifsInodeInfo),
837 0, (SLAB_RECLAIM_ACCOUNT|
840 if (cifs_inode_cachep == NULL)
847 cifs_destroy_inodecache(void)
849 kmem_cache_destroy(cifs_inode_cachep);
853 cifs_init_request_bufs(void)
855 if (CIFSMaxBufSize < 8192) {
856 /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
857 Unicode path name has to fit in any SMB/CIFS path based frames */
858 CIFSMaxBufSize = 8192;
859 } else if (CIFSMaxBufSize > 1024*127) {
860 CIFSMaxBufSize = 1024 * 127;
862 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
864 /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
865 cifs_req_cachep = kmem_cache_create("cifs_request",
867 MAX_CIFS_HDR_SIZE, 0,
868 SLAB_HWCACHE_ALIGN, NULL);
869 if (cifs_req_cachep == NULL)
872 if (cifs_min_rcv < 1)
874 else if (cifs_min_rcv > 64) {
876 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
879 cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
882 if (cifs_req_poolp == NULL) {
883 kmem_cache_destroy(cifs_req_cachep);
886 /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
887 almost all handle based requests (but not write response, nor is it
888 sufficient for path based requests). A smaller size would have
889 been more efficient (compacting multiple slab items on one 4k page)
890 for the case in which debug was on, but this larger size allows
891 more SMBs to use small buffer alloc and is still much more
892 efficient to alloc 1 per page off the slab compared to 17K (5page)
893 alloc of large cifs buffers even when page debugging is on */
894 cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
895 MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
897 if (cifs_sm_req_cachep == NULL) {
898 mempool_destroy(cifs_req_poolp);
899 kmem_cache_destroy(cifs_req_cachep);
903 if (cifs_min_small < 2)
905 else if (cifs_min_small > 256) {
906 cifs_min_small = 256;
907 cFYI(1, ("cifs_min_small set to maximum (256)"));
910 cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
913 if (cifs_sm_req_poolp == NULL) {
914 mempool_destroy(cifs_req_poolp);
915 kmem_cache_destroy(cifs_req_cachep);
916 kmem_cache_destroy(cifs_sm_req_cachep);
924 cifs_destroy_request_bufs(void)
926 mempool_destroy(cifs_req_poolp);
927 kmem_cache_destroy(cifs_req_cachep);
928 mempool_destroy(cifs_sm_req_poolp);
929 kmem_cache_destroy(cifs_sm_req_cachep);
935 cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
936 sizeof(struct mid_q_entry), 0,
937 SLAB_HWCACHE_ALIGN, NULL);
938 if (cifs_mid_cachep == NULL)
941 /* 3 is a reasonable minimum number of simultaneous operations */
942 cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
943 if (cifs_mid_poolp == NULL) {
944 kmem_cache_destroy(cifs_mid_cachep);
948 cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
949 sizeof(struct oplock_q_entry), 0,
950 SLAB_HWCACHE_ALIGN, NULL);
951 if (cifs_oplock_cachep == NULL) {
952 mempool_destroy(cifs_mid_poolp);
953 kmem_cache_destroy(cifs_mid_cachep);
961 cifs_destroy_mids(void)
963 mempool_destroy(cifs_mid_poolp);
964 kmem_cache_destroy(cifs_mid_cachep);
965 kmem_cache_destroy(cifs_oplock_cachep);
968 static int cifs_oplock_thread(void *dummyarg)
970 struct oplock_q_entry *oplock_item;
971 struct cifsTconInfo *pTcon;
981 spin_lock(&GlobalMid_Lock);
982 if (list_empty(&GlobalOplock_Q)) {
983 spin_unlock(&GlobalMid_Lock);
984 set_current_state(TASK_INTERRUPTIBLE);
985 schedule_timeout(39*HZ);
987 oplock_item = list_entry(GlobalOplock_Q.next,
988 struct oplock_q_entry, qhead);
989 cFYI(1, ("found oplock item to write out"));
990 pTcon = oplock_item->tcon;
991 inode = oplock_item->pinode;
992 netfid = oplock_item->netfid;
993 spin_unlock(&GlobalMid_Lock);
994 DeleteOplockQEntry(oplock_item);
995 /* can not grab inode sem here since it would
996 deadlock when oplock received on delete
997 since vfs_unlink holds the i_mutex across
999 /* mutex_lock(&inode->i_mutex);*/
1000 if (S_ISREG(inode->i_mode)) {
1001 #ifdef CONFIG_CIFS_EXPERIMENTAL
1002 if (CIFS_I(inode)->clientCanCacheAll == 0)
1003 break_lease(inode, FMODE_READ);
1004 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1005 break_lease(inode, FMODE_WRITE);
1007 rc = filemap_fdatawrite(inode->i_mapping);
1008 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1009 waitrc = filemap_fdatawait(
1011 invalidate_remote_inode(inode);
1017 /* mutex_unlock(&inode->i_mutex);*/
1019 CIFS_I(inode)->write_behind_rc = rc;
1020 cFYI(1, ("Oplock flush inode %p rc %d",
1023 /* releasing stale oplock after recent reconnect
1024 of smb session using a now incorrect file
1025 handle is not a data integrity issue but do
1026 not bother sending an oplock release if session
1027 to server still is disconnected since oplock
1028 already released by the server in that case */
1029 if (!pTcon->need_reconnect) {
1030 rc = CIFSSMBLock(0, pTcon, netfid,
1031 0 /* len */ , 0 /* offset */, 0,
1032 0, LOCKING_ANDX_OPLOCK_RELEASE,
1033 false /* wait flag */);
1034 cFYI(1, ("Oplock release rc = %d", rc));
1036 set_current_state(TASK_INTERRUPTIBLE);
1037 schedule_timeout(1); /* yield in case q were corrupt */
1039 } while (!kthread_should_stop());
1049 INIT_LIST_HEAD(&cifs_tcp_ses_list);
1050 INIT_LIST_HEAD(&GlobalOplock_Q);
1051 #ifdef CONFIG_CIFS_EXPERIMENTAL
1052 INIT_LIST_HEAD(&GlobalDnotifyReqList);
1053 INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1056 * Initialize Global counters
1058 atomic_set(&sesInfoAllocCount, 0);
1059 atomic_set(&tconInfoAllocCount, 0);
1060 atomic_set(&tcpSesAllocCount, 0);
1061 atomic_set(&tcpSesReconnectCount, 0);
1062 atomic_set(&tconInfoReconnectCount, 0);
1064 atomic_set(&bufAllocCount, 0);
1065 atomic_set(&smBufAllocCount, 0);
1066 #ifdef CONFIG_CIFS_STATS2
1067 atomic_set(&totBufAllocCount, 0);
1068 atomic_set(&totSmBufAllocCount, 0);
1069 #endif /* CONFIG_CIFS_STATS2 */
1071 atomic_set(&midCount, 0);
1072 GlobalCurrentXid = 0;
1073 GlobalTotalActiveXid = 0;
1074 GlobalMaxActiveXid = 0;
1075 memset(Local_System_Name, 0, 15);
1076 rwlock_init(&GlobalSMBSeslock);
1077 rwlock_init(&cifs_tcp_ses_lock);
1078 spin_lock_init(&GlobalMid_Lock);
1080 if (cifs_max_pending < 2) {
1081 cifs_max_pending = 2;
1082 cFYI(1, ("cifs_max_pending set to min of 2"));
1083 } else if (cifs_max_pending > 256) {
1084 cifs_max_pending = 256;
1085 cFYI(1, ("cifs_max_pending set to max of 256"));
1088 rc = cifs_init_inodecache();
1090 goto out_clean_proc;
1092 rc = cifs_init_mids();
1094 goto out_destroy_inodecache;
1096 rc = cifs_init_request_bufs();
1098 goto out_destroy_mids;
1100 rc = register_filesystem(&cifs_fs_type);
1102 goto out_destroy_request_bufs;
1103 #ifdef CONFIG_CIFS_UPCALL
1104 rc = register_key_type(&cifs_spnego_key_type);
1106 goto out_unregister_filesystem;
1108 #ifdef CONFIG_CIFS_DFS_UPCALL
1109 rc = register_key_type(&key_type_dns_resolver);
1111 goto out_unregister_key_type;
1113 oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1114 if (IS_ERR(oplockThread)) {
1115 rc = PTR_ERR(oplockThread);
1116 cERROR(1, ("error %d create oplock thread", rc));
1117 goto out_unregister_dfs_key_type;
1122 out_unregister_dfs_key_type:
1123 #ifdef CONFIG_CIFS_DFS_UPCALL
1124 unregister_key_type(&key_type_dns_resolver);
1125 out_unregister_key_type:
1127 #ifdef CONFIG_CIFS_UPCALL
1128 unregister_key_type(&cifs_spnego_key_type);
1129 out_unregister_filesystem:
1131 unregister_filesystem(&cifs_fs_type);
1132 out_destroy_request_bufs:
1133 cifs_destroy_request_bufs();
1135 cifs_destroy_mids();
1136 out_destroy_inodecache:
1137 cifs_destroy_inodecache();
1146 cFYI(DBG2, ("exit_cifs"));
1148 #ifdef CONFIG_CIFS_DFS_UPCALL
1149 cifs_dfs_release_automount_timer();
1150 unregister_key_type(&key_type_dns_resolver);
1152 #ifdef CONFIG_CIFS_UPCALL
1153 unregister_key_type(&cifs_spnego_key_type);
1155 unregister_filesystem(&cifs_fs_type);
1156 cifs_destroy_inodecache();
1157 cifs_destroy_mids();
1158 cifs_destroy_request_bufs();
1159 kthread_stop(oplockThread);
1162 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1163 MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
1165 ("VFS to access servers complying with the SNIA CIFS Specification "
1166 "e.g. Samba and Windows");
1167 MODULE_VERSION(CIFS_VERSION);
1168 module_init(init_cifs)
1169 module_exit(exit_cifs)